DUNNO is proprietary software. It is built on top of excellent open-source components — this page lists them all, with their licenses.
© 2026 DUNNO. All rights reserved.
DUNNO is closed-source, proprietary software and is licensed, not sold. The app is available in two editions, each governed by the same End User License Agreement:
You may not copy, modify, redistribute, sell, or reverse-engineer the app, except where mandatory law expressly allows it. The full license terms:
© The Android Open Source Project (Google)
Core app framework and UI: Jetpack Compose, Material 3, Room database, Lifecycle, WorkManager, Navigation, Biometric, ExifInterface, Media3 (video transcoding), and more.
© JetBrains s.r.o.
The programming language and asynchronous runtime the app is written in.
© Square, Inc.
Secure WebSocket (WSS) signalling for video calls.
© Google, Inc.
JSON serialization for message and contact data.
© ZXing authors (Google) · © JourneyApps
QR-code scanning and generation for adding contacts.
© Stream.io
Prebuilt WebRTC library powering Fast Call and video calls. (The WebRTC native code inside it is BSD-licensed, see below.)
© Timothy Wall and contributors
Bridge to native cryptography libraries. JNA is dual-licensed (LGPL 2.1 or Apache 2.0); DUNNO uses it under the Apache License 2.0.
© The OpenSSL Project
Cryptographic primitives, as bundled within SQLCipher (below).
© The Tor Project · © Guardian Project
The anonymous network layer. All chat and walkie-talkie traffic runs over Tor — this is what hides your IP address from your contacts.
© Jarno Elonen and the NanoHTTPD authors
The tiny local web server that lets your device receive messages directly from your contacts.
© The WebRTC project authors (Google)
Peer-to-peer audio and video engine with DTLS-SRTP end-to-end encryption, bundled via stream-webrtc-android.
© Terl / Goterl Ltd
Easy, safe bindings to the libsodium cryptography library. Used unmodified; its source code is available at github.com/terl/lazysodium-android.
© 2013–2026 Frank Denis (jedisct1)
The modern, audited cryptography library behind DUNNO's end-to-end encryption.
© Zetetic LLC
Full-database encryption for all on-device storage. License: zetetic.net/sqlcipher/license.
By D. Richard Hipp and contributors — public domain
The database engine inside SQLCipher.